C clamp



g- 1939 x J. E. WILLIAMS 0 CLAMP Filed June 14, 19 38 INVENTOR -J. f].William? as ATTORNEY Patented Aug. 8, 1939 UNITED STATES PATENT OFFICE.

Application June 14,

3 Claims.

This invention relates generally to a mechanical clamping device, and inparticular the invention is directed to an improvement in that type oftool known as G clamps.

In present C clamps, the screw is threaded through one leg of the clampyoke and carries a swivel, work engaging head on its inner end. Whilesuch head is intended to engage the work in non-turning relation, inmany instances especially where the head is engaging on angular surfaceor the like--the head binds on the screw and as a result rotatestherewith and crawls relative to the work. This prevents proper andready clamping of separate members together. For example, metallicmembers which are to be welded together must be held in positiveengagement, and such is difiicult to obtain with ordinary C clamps forthe reason above set forth.

It is therefore the principal object of my invention to provide a Cclamp wherein the adjustable work engaging rod or bar is non-rotatableand engages the work with a positive and vice-like action; there beingno tendency for said work engaging rod to crawl or slip from the work.

A further object of the invention is to produce a simple and inexpensivedevice and yet one which will be exceedingly effective for the purposefor which it is designed.

These objects I accomplish by means of such structure and relativearrangement of parts as will fully appear by a perusal of the followingspecification and claims.

The figure of the drawing is a side elevation of the tool, partly insection.

Referring now more particularly to the characters of reference on thedrawing, the tool comprises the usual C-shaped yoke l includingsubstantially parallel legs 2 and 3; there being a flat, work engagingface 4 formed on the inner edge of leg 2 adjacent its outer end.

A rod 5 slidably projects through a bore 6 formed in the outer end ofleg 3 at right angles to the leg axis and in the common plane of theyoke; the inner end portion of said rod providing a jaw opposed to face4. Rod 5 is preferably circular in cross section, and is of a length sothat when the inner end engages face 4, the outer end extends beyond leg3.

Such outer end of the rod is formed with an integral but ofiset sleeve Iwhich is threaded for the reception of a left-hand screw 8 disposedparallel to the rod and adjacent thereto, said screw being substantiallythe same length as the rod. The inner end portion of this screw 8 isreduced in diameter, as at 9, and projects through a bore II! in leg 3.An enlarged head is formed on the extremity of the portion 9 inwardly ofleg 3 and such head prevents outward movement of the screw relative tothe leg 3. A thrust washer I2 1938, Serial No. 213,713

surrounds portion 9 between the head H and leg 3. By reason of the abovearrangement, screw 8 may freely rotate but cannot separate from or movelongitudinally relative to the yoke.

The screw is cut with a left-hand thread so that with clockwise rotationthereof, by means of a sliding transverse handle I3 on the outer end ofthe screw, sleeve 1 will advance toward the yoke. With such advance, rod5 likewise slides inward toward face 4 and without rotating. Thus,

work may be clamped between face 4 and rod 5 and the rod will not tendto crawl or slip therefrom. Round or irregularly shaped members can beclamped together with case. As the rod 5 is smooth, the clamp can beused by welders and any spots or particles of metal which may adhere canbe quickly filed or ground off, and which cannot be done with ordinary Cclamps, as the spots adhere in the threads.

From the foregoing description it will be readily seen that I haveproduced such a device as substantially fulfills the objects of theinvention as set forth herein.

While this specification sets forth in detail the present and preferredconstruction of the device, still in practice such deviations from suchdetail may be resorted to as do not form a departure from the spirit ofthe invention, as defined by the appended claims.

Having thus described my invention, what I claim as new and useful anddesire to secure by Letters Patent is:

1. A G clamp comprising a yoke, a work engaging face on the inner edgeof one leg of the yoke, a rod slidably projecting through the other legfor movement to and from the face and at substantially right anglesthereto, and whose end adjacent said face forms a cooperating workengaging face, a handle actuated screw rotatably mounted on andprojecting outwardly from said other leg of the yoke parallel to therod, the screw being longitudinally immovable relative to the yoke, andmeans between the rod and screw to slide the former upon rotation of thelatter.

2. A device as in claim 1, in which the screw is cut with left-handthread, whereby when said screw is rotated clockwise, the rod will slidetoward the work engaging face.

3. A C clamp comprising a yoke having fixed spaced legs, a work engagingrod slidably projecting through one leg at right angles to and adjacentthe free end thereof, a screw projecting outwardly from said legparallel to and adjacent the rod, means mounting the screw on said legfor rotative but not longitudinal movement and V a sleeve rigid with therod at its outer end and having threaded engagement with the screw.

JOHN E. WILLIAMS.

